Clicker Questions

Clicker #1

To balance a chemical equation, it may be necessary to adjust the A. coefficients.

B.

subscripts.

C. formulas of the products.

D. number of products.

Clicker #2

Prefixes are used in what kind of compounds?

A. metallic.

B.

ionic.

C. covalent.

D. acidic.

Clicker #3

What would be the correct formula for aluminum sulfate?

A. AlSO 4 B. Al 2 SO 4 3 C. Al 3 (SO 4 ) 2 D. Al 2 (SO 4 ) 3

Clicker #4

What would be the correct name for Al 2 S 3 ?

A. Aluminum Sulfide B. Aluminum (III) Sulfide C. Diboron Trisulfide D. None of the above

Clicker #5

What is the formula mass for iron (III) hydroxide?

A. 73 amu B. 90 amu C. 107 amu D. 142 amu

Clicker #6

Which coefficients correctly balance the formula equation CaCO 3 (s) → CaO(s) + CO 2 (g)?

A. 1, 1, 1 B. 1, 3, 1 C. 2, 6, 3 D. 3, 1, 2

Clicker #7

Which coefficients correctly balance the formula equation NH 4 NO 2 → N 2 + H 2 O?

A. 1, 2, 2 B. 1, 1, 2 C. 2, 1, 1 D. 2, 2, 2

Clicker #8

Lead (III) chloride reacts with calcium hydroxide to form calcium chloride and lead (III) hydroxide. What are the coefficients for this reaction?

A. 3, 2, 2, 3 B. 2, 3, 2,2 C. 2, 3, 3, 2 D. None of these

Clicker #9

What is the percent by mass of carbon in acetone, C 3 H 6 O?

A. 20.7% B. 1.61% C. 30.0% D. 62.1%

Clicker #10

The lowest whole-number ratio of the elements in a compound is called the ____.

A. binary formula B. molecular formula C. empirical formula D. representative formula

Clicker #11

What would be the best name for Cr(OH) 3 ?

A. Mono Chromium trioxide trihydride B. Chromium (III) hydroxide C. Chromium Trioxide Trihydride D. Chromium Hydroxide

Clicker #12

Chemical equations must be balanced to satisfy ____.

A. the law of definite proportions B. the law of multiple proportions C. the law of conservation of mass D. Avogadro’s principle

Clicker #13

Which of the following could be an empirical formula?

A. N 2 O 5 B. N 2 O 4 C. N 2 H 6 D. More than one could be an empirical formula

Clicker #14

If a compound has an empirical formula of COH 2 , has a molecular weight equal to 60. g/mol, what is the molecular formula?

A. C 3 O 1 H 6 B. C 2 O 2 H 4 C. C 1 O 2 H 16 D. C 3 O 3 H 6

Clicker #15

What is the formula for tetraphosphorus hexoxide? A.

4 P 7 O B. P 4 O 6 C. P 3 O 7 D. P 4 O 7

Clicker #16

What is the formula for magnesium iodide?

A. MgI B. MgI 2 C. Mg 2 I D. Mg 2 I 2

Clicker #17

What would be the best name for K 3 PO 4 ?

A. Potassium Phosphate B. Potassium (I) Phosphate C. Tripotassium Phosphate D. Potassium Phosphide Oxide

Clicker #18

In every balanced chemical equation, each side of the equation has the same number of ____.

A. coefficients B. moles C. molecules D. atoms of each element

Clicker #19

Which coefficients correctly balance the formula equation Zn(OH) 2 + CH 3 COOH → Zn(CH 3 COO) 2 + H 2 O?

A. 1, 2, 1, 1 B. 2, 1, 2, 1 C. 1, 2, 1, 2 D. 2, 1, 1, 2

Clicker #20

What is the balanced equation when aluminum reacts with copper(II) sulfate to produce aluminum sulfate and copper?

A. Al + Cu 2 S →Al 2 S + Cu B. 2Al + 3CuSO 4 → Al 2 (SO 4 ) 3 + 3Cu C. Al + CuSO 4 → AlSO 4 + Cu D. 2Al + Cu 2 SO 4 → Al 2 SO 4 + 2Cu

Clicker #21

The percent composition of aluminum in aluminum hydroxide is: A. 50% B. 25% C. 14% D. None of the answers are correct

Clicker #22

N 2 S 3 is properly named: A. nitrogen sulfide B. nitrogen (III) sulfide C. nitrogen (II) sulfide D. None of the answers are correct

Clicker #23

The red numbers in the image below represent ________ A. subscripts B. Coefficients C. I don’t know, and don’t want to try D. None of the answers are correct

Clicker #24

The blue numbers in the image below represent ________ A. I don’t know, and don’t want to try B. Coefficients C. Subscripts D. None of the answers are correct

Clicker #25

In a reaction in which hydrogen reacts with oxygen to produce water, which substances are the reactants?

A. hydrogen only B. oxygen only C. water D. both hydrogen and oxygen

Clicker #26

11. How many atoms of oxygen are represented in 2Ca(NO 3 ) 2 ?

A. 4 B. 6 C. 10 D. 12